Tape it up and your are done. It takes patience and some close inspection, but every connector has removeable spade connectors. I'll try and get some pictures in here when I get more time. Take the steering wheel horn switch wire and hook it to the common middle usually terminal of the switch.
I highlighted the part of the instructions that mentions the wire. If it worked solder it or use spade connectors on both parts.
Hella supertones wiring horrors - I actually just used the wires in the front for the stock horns. I'll try and get some pictures in here when I get more time.
How To Install A Hella Horn On Your Motorcycle I tried splicing into the wire going into 86 and the switch triggered both the stock and hellas and the actual horn on the steering wheel didn't do anything. So it is ideal to use them and you can return everything to stock without resoldering wires later if you have to. Cutting is far far easier. I hooked up the hellas as follows... I have a switch with 3 plugs power, acc, and ground. Put the wire along the wire that is already on the connector and solder it in place. I just want to be sure before I splice into it.